user155724

Most recent activity

• Reading NDEF-Message using PN532

  @user155724 started

  • 2 comments
  • 250 views

  @Gordon replied
• Reading NDEF-Message using PN532

  in Interfacing • 7 months, 1 week

  

  Hi,

  I would like to create an NFC tag reader using a PN532. In the end I would like to read NDEF messages from any NDEF tag.

  The general interfacing already works. I wired up the MDBT42Q breakout and a PN532 breakout board.

  Using the PN532 module I am able to read the card id, as it's shown in the tutorial.

  Now, I would like to read all bytes and parse an NDEF message with the library https://github.com/andijakl/ndef-nfc/.

  The idea is to read all bytes of the NDEFMessage and then parse them with the following call:

  var ndefMessage = NdefLibrary.NdefMessage.fromByteArray(byteArray);
  

  I managed to load the minified version of the library within espruino, I just need to read all the bytes of the tag.
  So I started modifying the PN532 module in an own fork and created the function findCardsAllBytes, which looks like this:

  PN532.prototype.findCardsAllBytes = function(callback) {
    this.cmd([C.PN532_COMMAND_INLISTPASSIVETARGET,
               1, // max targets (max=2)
               C.PN532_BRTY_ISO14443A // modulation type
              ]);
    var p = this;
    setTimeout(function() { // wait for NFC poll (30ms)
      var d = p.i2c.readFrom(C.PN532_I2C_ADDRESS, 20+1).slice(1);
      if (d[6]==C.PN532_COMMAND_INLISTPASSIVETARGET+1) {
        if (d[7]!=1) print("Expecting 1 tag, got "+d[7]);
        callback(d);
      }
    }, 30);
  };
  

  Do you have an idea which I2C commands I need to read all the raw bytes of the tag?

  Thank you!
  Martin

• Error handling for puck.js communication

  @user155724 started

  • 5 comments
  • 482 views

  @user155724 replied
• Error handling for puck.js communication

  in Puck.js, Pixl.js and MDBT42 • 8 months

  

  Hi,

  Oh, I was primarily thinking of adding a tutorial about accessibility use cases to the puck-js documentation.
  Here are 2 documented tutorials:
  https://www.asterics.eu/manuals/asterics-grid/514_uart-action-tutorials.html#uart-action-tutorials

  It's up to you!
  Martin

• Error handling for puck.js communication

  in Puck.js, Pixl.js and MDBT42 • 8 months

  

  Hi Gordon,

  Thanks for the hint, we have finally managed it by doing some modifications in our fork:
  https://github.com/asterics/EspruinoWebTools

  Your Espruino devices and the fact that you can easily program then via Web Bluetooth and Javascript are really awesome. This enables also a lot of possibilities for people with disabilities in combination with our AAC software AsTeRICS Grid.
  We have added a UART action which allows to communicate with your devices and enable interfacing accessible toys or using the puckmote webpage and the IR-database to do environmental control for people with disabilities:
  https://www.asterics.eu/manuals/asterics-grid/05_actions.html#uart-action

  We will also use new feature this week in a series of workshops in Nairobi in Kenia.
  I would be happy, if you could share the AsTeRICS Grid integration also in your platforms.

  Thanks
  Martin

• Error handling for puck.js communication

  in Puck.js, Pixl.js and MDBT42 • 8 months, 2 weeks

  

  Hi,

  I am trying to add puckjs support for the Open Source AsTeRICS Grid AAC software in order to have an IR device or to remote controll battery-powerd toys using the FET output (see PR#340).

  Is there a way to handle bluetooth disconnect or write error when using Puck.writefunction?
  I would like to notify the user in such a case and maybe trigger a reconnect.

  I also tried to use Puck.connect(), but this always forces me to reconnect to the device. If there was a previous successful connection, I would like to reuse it, not having to ask the user again.

  Thanks for you help.